Rotary disk drill



July 1, 1930. W.H OLDAWAY ROTARY DISK DRILL Filed July 20, 1925 PatentedJuly 1, 1930 UNITED STATES FATE NT former-:1

WILLIAM s. HOLDAWAY, OF SAWTELLE, CALIFORNIA, 'AssIeNoR, BY MESNEAssien- MENTS, TO BYRON JACKSON 00., or WEST BERKELEY, CALIF R -9aColeman.

TION OF DELAWARE ROTARY DISK DRILL I Application filed July 20,

This invention relates to rotary disk drills such as used in drillingwells. In this type of drill the cutter disks are carried below the endof the shank of the drill,

and as usually constructed, each disk is carried upon a fork, the forksbeing located opposite to each other. In using drills of this type, ithas been found that thematerial cut or excavated by the disksaccumulates between the edges of the disks and the end of the shank andfrequently becomes clogged at this point. This clogged materialsometimes sets and becomes so hard that it is very difficult to remove.

The general object of this invention is to provide a rotary disk drillof this type so constructed as to prevent the clogging of materialbetween the disks and the shank; also to provide improved means forinsuring that the water supply will be delivered at the face of thedisks.

Further objects of the invention will appear hereinafter.

The invention consists in the novel parts and combination of parts to bedescribed hereinafter, all of which contribute to produce an efiicientrotary disk drill.

A preferred embodiment of the invention is described in the followingspecification, while the broad scope of the invention is pointed out inthe appended claims.

In the drawings;

Fig. 1 is a side elevation of a rotary disk drill embodying myinvention, partially broken away and shown in section.

Fig. 2 is a View similar to Fig. 1 but showing the lower portion of thedrill in section.

Fig. 3 is a bottom plan of the drill.

Fig. 4 is a horizontal cross section taken on the line 4z"-4: of Fig. 1.

In practicing the invention, I prefer to construct a drill with anelongated shank 1, the upper end of which is provided with means such asa threaded'tapered pin 2 to be secured to the lower end of the toolstring. The lower ends of the two oppositely disposed forks 3 areprovided with disks which extend down a considerable dis .tance belowthe transverse end face 4 of the shank in such a way that a relativelydeep 1925. Serial No.- 44,774.

throat 5 is formed between therotary disks 6a'nd the: endface 4:. Thedisksare mounted oppositeto eachv other and sotliat the planes of thedisks are substantially parallel with each other, though the axe'sof theclisk'smay be thrown slightly out of alignment with ered or wedge formin its longitudi'nal' sec-@ tion' taken in a plane perpendicular to theaxes of rotation of the disks,1and this" nozzle is provided with a duct9" which cemmuni'-- cates with the bore 7. It is detachably se I curedby a thread connection. The ower-'10 end of this nozzle extend'shdownand pro;

jects' into the space between the disks,

which point the nozzle delivers the water; to the disks. I

In order to enable the nozzle 8 to pas 7 form its function of expellingthe cuttings? fromthe disks, its horizontal"cross-section is greater inonedire'ction than the other, and it 'is' preferably" constructed sothat, as I viewed in horizontalc'rosss;ection (see Fig. 4) thelongitudinal axis of the cross section extends substantiallyperpendiculanto' the planes of the disks. In this way; when the drillrotates the nozzle gives the effect of a central blader'otating in thespace'between the disks' a'nd the end of'the' shank, and the effect ofpushing the cl'ogged material out of the throat.

The depth of the throat i'spr'eferablysuch that the" dist'ance from theedgesofthe disks to the endof'th'e shank is substantially equal to'halfthe'diameter of'the disk- I t is understood that the eniliodiiiierit-ofithe invention described herein is'o n'ly" one of the many embodimentsthis inventionni'ay take, and" I dofnot wish to bl'imited in thepractice ofthe' invention,- nor'jin the claims, to the particularembodiment set forth,

1. A rotary disk drill having a shank with forks extending downwardlyfrom the shank and having a transverse end face disposed between theforks and cooperating with the same to form a relatively deep throatbetween the forks, disk cutters carried respectively by the forks, saidshank having a Water bore extending through the same, and a separatenozzle detachably secured to the said end face extending down into thethroat to a point adjacent the upper edges of the cutters, and having aduct communicating with the water bore and delivering water into thespace between the disks, said nozzle being in the form of a taperedblade with a horizontal cross-section greater in one direction than inanother, and with its large end seating against the said end face, thespace between the nozzle and said forks being left open so that thenozzle operates during the rotation of the drill to expel the materialtending to lodge above the level of the disks and between the disks andthe said end face.

2. A rotary disk drill having a shank with forks extending downwardlyfrom the shank and with a transverse end face connecting the forks andcooperating with the same to form a relatively deep throat between theforks, disk cutters carried respectively by the forks, said shank havinga water bore extending down through the same, and a separate nozzledetachably secured co-axially at the said end face, extending downwardlyinto the throat and having a duct communicating with the water bore fordelivering water into the space between the disks, said nozzle being inthe form of a tapered blade whose cross-section has a greater dimensionin one direction than in another, and operatingto expel cuttings fromsaid disks, there being a space between the sides of the nozzle and theforks, said throat being of such depth that the distance to the end ofthe shank from the edge of the disks is substantially equal to half thediameter of the disks. 7 i

8. A rotary disk drill having a shank with forks extending downwardlyfrom the shank, disk cutters carried respectively by the forks, saidshank having a water bore extending down through the same, and aseparate nozzle detachably secured to the lower end of the shankextending down into the space between the cutters and having a ductcommunicating with the water bore and delivering the water to the disks,said nozzle having the form of a tapered blade operating during therotation of the drill to expel the material between the disks and theend of the shank.

4:. A rotary disk drill having a shank with forks extending downwardlyfrom the shank and with a transverse end face connecting the forks, diskcutters carried respectively by the forks, said shank having a waterbore blade during the rotation of the drill to engage and expel materialbetween the disks and the end of the shank. Signed at Los Angeles,Calif, this 2d day of June, 1925.

WILLIAM S. HOLDAVVAY.

